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J. T. COLLINS. OVEREDGB SEWING MACHINE.

Patented Oct. 12,1897.

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J.".T. OOLLINS." OYBREQGE SEWING MACHINE.

1 No. 591,383. Patented Oct 12, 1897.

UNITED ST T- s PATENT Fries;

JOHN T. COLLINS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROWMACHINE COMPANY, OF SAME PLACE,

'IOY/EREDGE SEWING-MACHINE.

SIPEOIFICATION rorniing m of Letters Patent No. 591,383, dated October12, 1897.

Ap eal... fiia may 20, 1897. Serial No. 637,419. (No model.)

T0 at whom, it may concern.-

Be it known that I, JOHN T. COLLINS, a citizen of the UnitedStates,residing in the city and county of Hartford and State of Connecticut,have invented certain new and useful Improvements inOverseaming-Machines; and I do hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming a part of this specification, and tothe figures and; letters of reference marked'thereon, I I

Myimprovements relate to overseamingmachines, my object being to producea new variety of overseam" or edge finish made from three threads, andthis invention consists in new forms of devices and new combinations ofdevices and mechanism for producing said new overseam or finish.

Figure 1 is a front elevation of the machine. Fig. 2 is a left-handelevation of the lower part of the machine, the door being removed todisplay the interior. I Fig. 3 is a top View of the left-hand portion ofthe machine with work-plate removed to display the interior. Figs. 4 '5,6, 7, 8, and 9 are diagrammatical views illustrating various stages ofthe stitchforming operations.- Fig. 10 is an enlarged sectional top viewof a portion of the secondthread looper. V I V I V Throughout thedrawings forming a part of this specification similar letters andfigures of reference indicate like parts.

A indicates the frame of the machine; B, the main shaft; C, theeccentric; D, the driving-pulley; E, the eccentric connection; F, theneedle-lever; G, the needle-bar; H, the needle, and I the presser-foot.

The lower grooved cam a is attached to the main shaftB, and is providedwith a gear a,

which meshes into a gear a attached to the upper grooved cam a which isoperatively supported upon the upper shaft a in such a manner that bothof the said grooved cams rotate together, causing the reciprocation andoscillation of the looper-carrier b, which is operatively'supported uponthesliding block b, which is adapted to reciprocate in a dovetail grooveformedby gibs b b secured to the cap or door 5 All of the partshereinabove specifically indicated by lettersof reference are similar inwork-plate, which is made for convenient observation of the loop-formingprocess while adjusting the parts. 20 is the door covering the left endof the machine; 21, thefeed-dog, with'an opening forthe passage of theloopcarrier 1; 22, the feed-carrier; 23,- the feed,-

lever; 24, the feed-eccentric connection, and

25 the feed eccentric. Two. thread-carrying looping instruments inaddition to the needle are employed in this machine, the one, 9,bein gadj ustably attached to and carried by the oscillating reciprocatorylooper-carrier 19, controlled by the grooves in cams a a while the otherlooper 1 is adj ustably attached to a carrier 30, pivotally mounted upona fixed stud or pin 31 and provided with an adjustable arm or pin 32,whose spherical head is received in a socket formed in one end of link33, the opposite end of said link embracing a spherical crank-pin 34 onthe main shaft B.

The path of looper 9 and the extent of its movement both above and belowthe workplate are determined by the forms of the two controllingcam-grooves. Its movements are performed in a plane parallel with theneedle, or substantially so; while the looper 1 is given a substantiallyuniform reciprocating motion in a direction transverse to the axis ofthe needle, its path lying diagonal to the plane of the other loopersmovement, so as to extend from on the rear side of the nee- .dles lineof motion to the front side of the line of motion of the looper 9, asindicated in Fig. 2.

The looper 1 is provided with a point .10, adapted to enter between theside of the vertical needle and the thread carried thereby,

looper 1 is also provided with a slabbing or The second-thread 19indicates the recess 12 to facilitate the passage of the point of thelooper 9 between the side of the secondthread looper and the threadcarried thereby, as will be further explained, and its operating portionis slightly inclined to the horizontal, the point being the moreelevated.

The looper 9 is provided with an eye 13 for carrying the third thread,the said eye being preferably countersunk and provided with the usualgrooves to facilitate the passage of the third thread, and it ispreferably slabbed, as indicated at 14:, Figs. 2 and 3, for the passageof the vertical needle II between the side of the said looper and itsthread above the fabric. The point 15 of the looper 9 is curved upwardand forward or toward the second-thread looper l for the purpose ofentering between the side of the latter and the thread carried thereby.

In order to explain the operations of the machine, it may be supposedthat its motion has been arrested at a stage in the operation when thevertical needle is at or near its lowest point, at which time theneedle, the two loopers and threads will be in relative positions,approximately, as illustrated in Fig. 4.

Upon starting up the machine the looper 1 advances toward the needlewhile the latter is rising, the point of said looper passing between thesaid needle and the thread carried thereby, while the looper 9 movesdownward to carry its point below the line of travel of the looper 1, asillustrated in Fig. 5. As the needle continues its upward movement thesecond-thread looper 1 continues through the loop of needle-thread,carrying its thread doubled through the loop of needle-thread to a pointbeyond the edge of the fabric, while the third-thread looper 9 is movingto the position illustrated in Fig. 6. As the needle rises farther thethird-thread looper 9 also rises, projecting its curved point betweenthe second-thread looper 1 and the thread carried thereby, as shown inFig. '7. The needle rising still farther, the second-thread looper 1withdraws, while the third-thread looper 9 advances, carrying its threaddoubled through the loop of second thread and beyond the path of theneedle. In so doing the loop of second thread is raised above the edgeof the fabric, but held back bysaid fabric and by the outer edge of thefinger 16, as illustrated in Fig. 8. The second-thread looper continuesto withdraw, the needle descends, passing down between the side of thethird-thread looper 9 and the thread carried thereby, while the saidthird-thread looper is retracting, as shown in Fig. 9. The needlecontinues its downward movement through the fabric, the thirdthreadlooper withdraws, leaving its thread passing doubled through loop ofsecond thread and around the needle, completing one full cycle ofoperations in forming stitches around the edge of the fabric. It will beobserved that as the needle rises out of the fabric its thread is heldbelow by the secondthread looper, as shown in Fig. (l, and that in thecompleted stitches the needle-thread or first thread extends doubledthrough a loop of third thread and the fabric, that the second threadextends doubled through a loop of first thread below the fabric, andthat the third thread extends doubled through a loop of the secondthread and around the doubled first thread above the fabric. The loopsof three threads are thus bound together around the edge of the fabric,forming a finish or seam thereon, which is, so far as I am aware, new inthe art, and will form the subject of a separate application.

It is of course understood that if desired the usual or any approvedforms of tension and take-up devices may be applied to any one or moreof the threads and that the workplate can be provided with the usualfinger to support the edge of the fabric and to receive the stitcheswhen no fabric is present.

Having thus described my invention, what I claim as new is- I 1. In anoverseaming-machine such as described, the combination of areciprocating thread-carrying needle, and two reciprocatingtln'ead-carrying loopers, one of said loopers moving in a pathtransverse to the axis of the needle, to enter the loop of needlethreadbelow the fabric, and the other looper moving transversely to thefirst-named loopers line of motion, to enter the loop of thread carriedby the said first-named looper and deliver its loop in position beneaththe necdle to be entered thereby as it penetrates the fabric.

2. In an overseaming-machine such as described the combination of thevertically-reciprocatin g thread-carryin g needle, the workplate, athread-carrying looper reciprocating horizontally beneath the work-platein proximity to the needle when below the workplate, to enter the loopof needle-thread, and a thread-carrying looper reciprocating verticallyand horizontally in proximity to the Ipaths of the first-named looperand the needle, to enter the loop of thread carried by said first-namedlooper below the work-plate and carry its thread above the work-plate inposition to be entered by the needle; substantially as described,whereby a loop of second thread will be carried through the loop ofneedle-thread, and a loop of third thread through the loop of secondthread, said third-thread loop being confined by a second loop ofneedle-thread passing through it and the fabric.

3. In an overseaming-machine such as described, the eombination of thework-plate, the reciprocating thread-carrying needle, a thread-carryinglooper reciprocating around or over the ed go of the work-plate in aplane substantially parallel with the ncedles path, and ahorizontally-reciprocating thread-carrying looper moving below thework-plate in a path diagonal to the plane of the firstnamed loopersmotion and extending from IIO a point in rear of the needle to a pointin front of the first-named looper; substantially IO horizontallybeneath the work-plate; and the thread-carrying looper 9 providedwith anentering-point, an eye and a recess 14:, said looper reciprocatingaround the edge of the work-plate from a point below looper 1 to a pointabove the Work-plate beneath the I 5 needle.

- J OHNT. COLLINS.

Witnesses: WINFIELD O. GRAHAM, ROBERT D. SMITH.

